5G NR PDSCH Timing Rules for Overlapping Downlink Scheduling

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Solution Overview

Problem

Current 5G NR specifications do not adequately consider UE processing timelines when handling overlapping configured and dynamic downlink transmissions, leading to unpredictable UE behavior and potential inefficiencies.

Innovation Solution

The UE prioritizes dynamic assignments over configured downlink assignments if the dynamic assignment's PDCCH ends before the configured assignment's start, and vice versa, based on timing relationships, ensuring predictable behavior and efficient resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE prioritizes dynamic assignments over configured downlink assignments based on timing relationships, then UE behavior becomes predictable and network flexibility is enhanced, but the complexity of handling overlapping transmissions increases

Engineering Contradiction:

Improvepredictability of UE behaviorVSAvoidcomplexity of handling overlapping transmissions

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic prioritization rules that adapt based on timing relationships between PDCCH and configured downlink transmissions. The UE dynamically determines which transmission to prioritize by comparing the end time of PDCCH scheduling a dynamic assignment with the start time of configured downlink assignments, allowing flexible handling of overlapping transmissions while maintaining predictable behavior through well-defined criteria

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes predetermined timing relationship criteria that the UE evaluates before making prioritization decisions. By defining specific conditions (PDCCH end time vs. configured assignment start time) in advance, the UE can systematically determine priority without complex real-time analysis, reducing operational complexity while ensuring predictable outcomes

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the UE considers timing relationships between PDCCH and configured downlink transmissions, then resource allocation efficiency improves, but the processing complexity at the UE increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidUE processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies partial action by having the UE consider only specific timing relationship parameters (PDCCH end time and configured assignment start time) rather than analyzing all possible transmission parameters. This selective approach improves resource allocation efficiency by focusing on critical timing aspects while keeping processing complexity manageable through limited evaluation scope

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If the network schedules dynamic downlink transmissions that may overlap with configured downlink transmissions, then network flexibility and adaptability improve, but the reliability of transmission handling decreases due to unpredictable UE behavior

Engineering Contradiction:

Improvenetwork scheduling flexibilityVSAvoidreliability of transmission handling

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent establishes a feedback mechanism where the network can infer UE behavior by knowing the timing relationship-based prioritization rules. Since the UE's prioritization decisions are determined by objective timing criteria (PDCCH end time versus configured assignment start time), the network can predict which transmissions the UE will prioritize, ensuring reliable transmission handling while maintaining scheduling flexibility

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12501447B2Methods and apparatuses for handling configured and dynamic downlink transmissions in a wireless communication network

Publication Date: 2025.12.16 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Techniques disclosed herein efficiently address prioritization by a UE regarding its reception behavior with respect to a configured downlink transmission that is overlapped by a dynamic assignment and/or the dynamic downlink transmission scheduled via the dynamic assignment. In at least one embodiment having applicability to operation of the UE in a communication network based on the 5G NR specifications, the techniques disclosed herein provide for predictable behavior by the UE as to when the UE prioritizes a configured Physical Downlink Shared Channel (PDSCH) versus another PDSCH. Correspondingly, a radio network node may exploit the predictable behavior of the UE to override a configured PDSCH in favor of a dynamic PDSCH, by transmitting the Physical Downlink Control Channel (PDCCH) that schedules the dynamic PDSCH so that a timing relationship between the PDCCH and the configured PDSCH is satisfied.